Is the function returning this error consistently? As per this documentation regarding connecting to Cloud SQL in Cloud Functions, connections to the database might be dropped by the infrastructure underlying Cloud Functions, so you will need to use a library that supports automatically reconnecting broken connections. Also you need to make sure you are setting maximum concurrent connections to 1 since Cloud Functions limits it to 1.
-- I did some research regarding re-connection using knex specifically, I suggest looking into this issue thread, which discusses reconnecting after a server disconnect. It might be the reason the connection keeps dropping in your case.
It is recommended to post development related questions on Stackoverflow as they will get more visibility. Groups is better suited for general discussion questions.
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